Fix #1999: broken federation with pods using allow-listing

api/funkwhale_api/federation/actors.py

@@ -13,6 +13,7 @@ logger = logging.getLogger(__name__)
 
 
 def get_actor_data(actor_url):
+    logger.debug("Fetching actor %s", actor_url)
     response = session.get_session().get(
         actor_url, headers={"Accept": "application/activity+json"},
     )

api/funkwhale_api/federation/authentication.py

@@ -46,15 +46,14 @@ class SignatureAuthentication(authentication.BaseAuthentication):
             domain = urllib.parse.urlparse(actor_url).hostname
             allowed = models.Domain.objects.filter(name=domain, allowed=True).exists()
             if not allowed:
+                logger.debug("Actor domain %s is not on allow-list", domain)
                 raise exceptions.BlockedActorOrDomain()
 
         try:
             actor = actors.get_actor(actor_url)
         except Exception as e:
             logger.info(
-                "Discarding HTTP request from blocked actor/domain %s, %s",
+                "Discarding HTTP request from actor/domain %s, %s", actor_url, str(e),
-                actor_url,
-                str(e),
             )
             raise rest_exceptions.AuthenticationFailed(
                 "Cannot fetch remote actor to authenticate signature"

api/funkwhale_api/federation/views.py

@@ -111,6 +111,13 @@ class ActorViewSet(FederationMixin, mixins.RetrieveModelMixin, viewsets.GenericV
         queryset = super().get_queryset()
         return queryset.exclude(channel__attributed_to=actors.get_service_actor())
 
+    def get_permissions(self):
+        # cf #1999 it must be possible to fetch actors without being authenticated
+        # otherwise we end up in a loop
+        if self.action == "retrieve":
+            return []
+        return super().get_permissions()
+
     def retrieve(self, request, *args, **kwargs):
         instance = self.get_object()
         if utils.should_redirect_ap_to_html(request.headers.get("accept")):

api/tests/federation/test_views.py

@@ -12,7 +12,7 @@ from funkwhale_api.federation import (
 )
 
 
-def test_authenticate_skips_anonymous_fetch_when_allow_list_enabled(
+def test_authenticate_allows_anonymous_actor_fetch_when_allow_list_enabled(
     preferences, api_client
 ):
     preferences["moderation__allow_list_enabled"] = True
@@ -23,6 +23,17 @@ def test_authenticate_skips_anonymous_fetch_when_allow_list_enabled(
     )
     response = api_client.get(url)
 
+    assert response.status_code == 200
+
+
+def test_authenticate_skips_anonymous_fetch_when_allow_list_enabled(
+    preferences, api_client, factories
+):
+    preferences["moderation__allow_list_enabled"] = True
+    library = factories["music.Library"]()
+    url = reverse("federation:music:libraries-detail", kwargs={"uuid": library.uuid},)
+    response = api_client.get(url)
+
     assert response.status_code == 403
 
 

changes/changelog.d/1999.bugfix

@@ -0,0 +1 @@
+Fixed broken federation with pods using allow-listing (#1999)